The role of scalar mesons in radiative vector meson decays is
investigated. The effects of scalar-isoscalar f_{0}(980) and
scalar-isovector a_{0}(980) mesons are studied in the mechanism of the radiative Phi-> / pi{+}pi{-}gamma and
phi-> / pi{0}eta gamma decays, respectively. A
phenomenological approach is used to study the radiative
phi-> / pi{+}p{-}gamma decay by considering the
contributions of sigma-meson, rho-meson and f_{0}-meson.
The interference effects between different contributions are
analyzed and the branching ratio for this decay is calculated. The
radiative phi-> / pi{0}eta gamma decay is studied
within the framework of a phenomenological approach in which the contributions of rho-meson, chiral loop and a_{0}-meson are
considered. The interference effects between different
contributions are examined and the coupling constants g_{phi
a_{0} gamma} and g_{a_{0}K{+}K{-}} are estimated using the experimental branching ratio for the
phi-> / pi{0}eta gamma decay. Furthermore, the
radiative rho{0}pi{+}pi{-}gamma$ and
rho{0}-> / pi{0}pi{0}gamma decays are studied to
investigate the role of scalar-isoscalar sigma-meson. The
branching ratios of the rho{0}-> / pi{+}pi{-}gamma
and rho{0}-> / pi{0}pi{0}gamma decays are
calculated using a phenomenological approach by adding to the
amplitude calculated within the framework of chiral perturbation
theory and vector meson dominance the amplitude of sigma-meson
intermediate state. In all the decays studied the scalar meson
intermediate states make important contributions to the overall
amplitude.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/57968-0/index.pdf |
| Date | 01 November 2003 |
| Creators | Kerman Solmaz, Saime |
| Contributors | Gokalp, Ahmet |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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